Thanks Marc. I tortured the histograms with curves and got this. It is x1.5 times native pixel size. 20MB
http://d1355990.i49.quadrahosting.co...6188_NB_HP.jpg
I even used GradientXterminator to get rid of gradients outside the main nebula and 'balance' colour. Got rid of the red outside the main nebula.
Bert